schneidee



3 Sheets--Sheet 1.

(No Model.)

R. SCHNEIDER.

GRINDING MILL.

Patented Nov. 1, 1881.

(No Model.)

3 Sheets-Sheet 2.. R; SCHNEIDER.

GRINDING MILL.

Patented Nov. 1,1881.

(No Model.) ,3 Sheets-Sheet 3.

R. SCHNEIDER.

' GRINDING MILL.

No. 249,106. Patented Nov. 1,1881.

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tlnrran STATES PATENT Orrrcn.

ROBERT SCHNEIDER, OF DUSSELDORF, GERMANY.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 249,106, dated November 1, 1881.

Application filed January 17, 1881.

To all whom it may concern:

Be it known that I, ROBERT SCHNEIDER, a subject of the King of Prussia, and residing in Diisseldorf, Germany, have invented certain Improvements in Grinding-Mills, (for which I have obtained a German patent, September 9, 1879, No. 10,866,) of which the following is a specification.

Myinvention relates to certainimprovements in grindingmills, the main objects ofmy invention being to improve the construction of the grinding-surfaces and facilitate the putting together and taking apart of the mill.

In the accompanying drawings, Figure 1, Sheet 1, is a vertical section of sufficient of my improved mill to illustrate my invention; Fig. 2, a vertical section of the shell; Fig. 3, an inverted plan of the shell; Figs. 4, 5, and 6, a plan, side view, and inverted plan, respectively, of the runner; Fig. 7, Sheet 2, a plan view of the shell attached to its frame; Fig. 8, Sheet 3, a plan of the frame-plate; Fig. 9, Sheet 2, a side view of the parts shown in Fig. 1; and Fig. 10, Sheet3, aside view, partly in section, of the frame, shell, reservoir, and operating mechanism.

A is the base-plate, which, as indicated in Fig. 10, may be mounted on any suitable frame. To this plate is secured the shell B by means of wedge-shaped projections g on the latter, Figs. 3, 7, 9, and 10, adapted to lugs h on the base-plate, the taper ofthe wedges being in the direction of the motion of the runner 0, so that when the runner revolves and tends to turn the shell the latter will only become more firmly held in place. The runner G is carried and turned by the vertical spindle D, through the medium of the balance-rynd E, a horizontal pin, 0, on the shaft being adapted to a corresponding groove in the under side of the ryud, while a pin, (1, of the runner G is adapted to a groove on the upper face of the rynd, but at right angles to the groove on the under side, so that the runner will be evenly balanced under all circumstances. Thcnpper portions of the grinding-faces of both runner and shell are provided with coarse teeth, as indicated in Figs. 1, 2, 3, and 5, while the lower portions are provided with radial ascending ribs a, each rib having a row of step-like teeth, as indicated in the (No model.) Patented in Germany September 9, 1579.

drawings. The runner O is, however, provided with fewer ribs or rows of teeth than the shell B, in order to prevent possiblejamming of the runner in the shell. Thus, as shown in the drawings, the runner has twenty-seven rows, while the shell has thirty. By this unequal arrangement of the teeth only one toothed rib of the runner (l can,'wl1en in operation, coincide at any one moment with any of the ribs of the shell, so that the power required to drive the mill is less than if the number ofribs on the two grinding-surfaces were even. The rim of the runner O is provided with a series of radial guides, 11, which are adapted to a corresponding annular recess in the shell B, as shown in Fig. l. The outer faces of these projectious or guides are slightly beveled upward, so that when the runner is adjusted closer to the shell by the vertical adjustment of the spindle D these projections present bearing-faces to come into contact with the shell and prevent the contact of the teeth of the two grindingfaces. These projections bhave tapering pendent extensions, which, when the mill is in operation, traverse an annular groove or channel, 6, in the base-plate A, Figs. 1 and 8. The upper part of the channel is inclosed by the shell B and rim of the runner 0. As the runner revolves the material from the reservoir F is ground and falls into the channel 6, the extensions of the projections I) acting as conveyers to carry the material round to be discharged through the elongated openingf, which is provided with a detachable discharge-spout.

As already pointed out, the fastening devices 9 It are self-tightening when the machine is in operation. When the mill is stopped, and it is desired to take the mill apart, it is only necessary to reverse the movement of the runner to loosen the shell, which can then be readily removed, ribs 71 i being provided on the outside of the shell, Figs. 2, 7, and 9, to facilitate this operation. The runner and balance-rynd can then be readily removed and the parts cleaned. Thus no tool is required either for taking the mill apart or putting it together again.

I claim as my invention-- 1. In a grinding-mill, the combination of the conical runner with the hollow conical shell,

both runner and shell having on the upper porjections g, and the runner and balance-rynd tions of their grinding-faces a series of coarse supported on said spindle, so as to be free for teeth, and on their lower portions radial ribs removal when the shell is taken away, allsub- 15 with step-like teeth, all substantially as destantially as set forth. 5 scribed. In testimony whereofI have signed my name 2. In a mill, the combination of the baseto this speeificationin the presence oftwo subplate, having lugs h, with a runner and a shell scribing Witnesses.

having projections g taperin" in the direction ofthe normal movementof thgrunner, substan- SbHNEIDER' 1o tially as set forth. Witnesses:

3. The combination of mill-spindle, the base- J OHANN HEINTGER,

plate having lugs 71, with the shell having pro- AUG. HKRTEE. 

